SOVEREIGN, ISM / SCIENCE PHOTO LIBRARY SOVEREIGN, ISM / SCIENCE PHOTO LIBRARY
Irregular heartbeat. Electrocardiogram (ECG) of electrical activity (yellow traces) in the heart in a case of auricular fibrillation. Two of the six ECG traces are shown here. Auricular fibrillation is also known as atrial fibrillation, and is an irregular heartbeat affecting the upper chambers (atria) of the heart. An ECG, as here, will show short, irregular and rapid electrical activity and heartbeats. There are many causes of this condition, which can be treated with drugs (such as beta blockers) and defibrillation (to shock the heart back into its normal rhythm). An ECG is obtained by using electrodes to detect the electrical activity of the heart.
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